You probably won't get much sleep if you let the kids have their friends sleepover, but they'll be superexcited! Get them a few movies to watch, and fill up the pantry with junk food. But if you want to take things a step further, theme the night around something they love, whether it's bringing back Christmas for a night, turning your basement into a Disney wonderland, or creating an outdoor movie theatre complete with a projector and large sheet.